3 research outputs found
Thermoeconomic and thermoenvironomic modeling and analysis of selected gas turbine power plants in Nigeria
This study presents comprehensive thermoeconomic and thermoenvironomic
modeling and analysis of selected gas turbine power plants in Nigeria using the
first and second laws of thermodynamics (exergy) concept. Exergetic analysis
was conducted using operating data obtained from the power plants to determine
the exergy destruction and exergy efficiency of each major component of the
gas turbine in each power plant. The results of the study showed that the combustion
chamber (CC) is the most exergy destructive component compared to
other cycle components. The percentage of exergy destruction in CC varies between
86.05% and 94.6%. By increasing the gas turbine inlet temperature (GTIT),
the exergy destruction of this component can be reduced. The total exergy improvement
potential of the selected plants varies from 54.04 to 159.88 MW. The
component with the highest exergy improvement potential is the CC, which has
the value that varies from 30.21 to 88.86 MW. Thermoeconomic analysis showed
that the cost of exergy destruction is high in the CC, and an increase in the
GTIT effectively decreases this cost. The exergy costing analysis revealed that the
unit cost of electricity produced in the plants ranged from cents 1.99/kWh (N3.16/
kWh) to cents 5.65 /kWh (N8.98/kWh). Thermoenvironomic analysis showed
that the CO2 emissions varied between 100.18 and 408.78 kg CO2/MWh, while
cost rate of environmental impact varied from 40.18 /h (44, 038. 23 N/h). The results further showed that CO2 emissions
and cost of environmental impact decrease with increasing GTIT. The sustainability
index increase with increasing GTIT. Finally, this study will assist efforts
to understand the thermodynamic losses in the gas turbine cycle, and to improve
efficiency as well as provide future recommendations for better performance,
sustainability, and lessening environmental impact of power plant